I want to make servo control system that consist of automatic system and manual system. For automatic system, i use sensor (Accelerometer and gyroscope) to move the servo. And for Manual system, i use VB 2010 interface through serial port that can move servo manually by User. I want to combine both manual and automatic system. So, when the automatic system runnning, we can add value manually too from VB 2010 interface. Then, the total servo value is: sensor Value + manual Value.

The problem is, how to write float/integer value from VB 2010 to arduino through serial port? Or it's better to use arduino processing than VB 2010?